Call him the makeout king

“CALL Me By Your Name” star Timothée

Chalamet — who’s at the Cannes Film Festival with his latest drama, “Beautiful Boy” — had an epic makeout session in the middle of Chopard’s bash on Friday. The actor was spotted locking lips several times with a “20something blond mystery woman.” “It wasn’t just a kiss,” a spy breathlessly said. “It was a full-blown, high-school-style makeout session in front of everyone.”

The source added that when the couple “weren’t smooching, they were holding hands. They either weren’t trying to hide, or were so in the moment, they didn’t care.”

Chalamet, 22, was telling pals at Chopard’s swanky black-tie function at a private estate that he had just gotten off a plane and had been hanging out with singer The Weeknd, who was seen on Thursday looking close with his ex Bella Hadid (who was not at the party). Chalamet dated Madonna’s daughter

Lourdes a few years ago while they were both at LaGuardia High School of Music & Art and Performing Arts.

Also, there was chaos getting to the remote venue — with some guests waiting over two hours. The diamond brand, wanting to keep the location secret, shuttled guests to the estate, but, “The problem was the shuttles only took eight people at a time, and there weren’t enough for the hundreds of guests,” said a source.

“People got out to walk when they were close enough, but security was locking arms at the gate to block people coming through. Everyone was pissed and upset. Once you got through there you then had to take a golf cart to the home. It took hours. It was miserable.”

When one guest noted that a party for “The Hunger Games” had years ago taken place at the same venue, another VIP quipped, “How fitting — since getting in was like ‘ The Hunger Games!’ ” Once inside, played.